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L4981 from ST,ST Microelectronics

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L4981

Manufacturer: ST

POWER FACTOR CORRECTOR

Partnumber Manufacturer Quantity Availability
L4981 ST 13 In Stock

Description and Introduction

POWER FACTOR CORRECTOR The L4981 is a high-voltage double-ended controller manufactured by STMicroelectronics. It is designed for offline power supplies and features a high-voltage startup circuit, reducing external component count.  

### **Key Specifications:**  
- **Input Voltage Range:** Up to 600V  
- **Operating Frequency:** Adjustable up to 500kHz  
- **Driver Output Current:** ±400mA (source/sink)  
- **Startup Current:** <150µA  
- **Supply Voltage (VCC):** 8.5V to 16V  
- **Protections:**  
  - Undervoltage Lockout (UVLO)  
  - Overvoltage Protection (OVP)  
  - Overcurrent Protection (OCP)  
  - Thermal Shutdown  

### **Features:**  
- **High-Voltage Startup:** Integrated HV startup regulator eliminates the need for an auxiliary winding.  
- **Dual Output Drivers:** Suitable for half-bridge or full-bridge topologies.  
- **Adjustable Dead Time:** Allows optimization of efficiency and thermal performance.  
- **Soft-Start Function:** Reduces inrush current during startup.  
- **Synchronization Capability:** Can be synchronized to an external clock.  

The L4981 is commonly used in AC-DC converters, LED drivers, and industrial power supplies.

Application Scenarios & Design Considerations

POWER FACTOR CORRECTOR

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